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CodeGen: Allow !associated metadata to point to aliases.

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This is a small extension of !associated, mostly useful for the implementation
convenience of instrumentation passes that RAUW globals with aliases, such
as LowerTypeTests.

Differential Revision: https://reviews.llvm.org/D64951

llvm-svn: 366502
This commit is contained in:
Peter Collingbourne 2019-07-18 21:37:16 +00:00
parent 8fbcf61f43
commit 658ff0579c
2 changed files with 9 additions and 3 deletions
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4
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -524,8 +524,8 @@ static const MCSymbolELF *getAssociatedSymbol(const GlobalObject *GO,
if (!VM)
report_fatal_error("MD_associated operand is not ValueAsMetadata");
GlobalObject *OtherGO = dyn_cast<GlobalObject>(VM->getValue());
return OtherGO ? dyn_cast<MCSymbolELF>(TM.getSymbol(OtherGO)) : nullptr;
auto *OtherGV = dyn_cast<GlobalValue>(VM->getValue());
return OtherGV ? dyn_cast<MCSymbolELF>(TM.getSymbol(OtherGV)) : nullptr;
}
static unsigned getEntrySizeForKind(SectionKind Kind) {

8
test/CodeGen/X86/elf-associated.ll
View File

@ -33,7 +33,7 @@
; CHECK-DAG: .section bbb,"awo",@progbits,h,unique,2
; CHECK-DAG: .section .data.k,"awo",@progbits,h
; Non-GlobalObject metadata.
; Non-GlobalValue metadata.
@l = global i32 1, section "ccc", !associated !5
!5 = !{i32* null}
; CHECK-DAG: .section ccc,"aw",@progbits
@ -42,3 +42,9 @@
@m = global i32 1, section "ddd", !associated !6
!6 = distinct !{null}
; CHECK-DAG: .section ddd,"aw",@progbits
; Aliases are OK.
@n = alias i32, i32* inttoptr (i64 add (i64 ptrtoint (i32* @a to i64), i64 1297036692682702848) to i32*)
@o = global i32 1, section "eee", !associated !7
!7 = !{i32* @n}
; CHECK-DAG: .section eee,"awo",@progbits,n,unique,3